Stress oscillation is a rare phenomenon and can be triggered only for several semi-crystalline polymers at a certain testing temperature, because it appears to be controlled by strain-induced oriented crystallization and related local heat release [4, 5], Amorphous PET exhibits stress oscillation in air at room temperature, but it presents no oscillation
It was found that no oscillation
was formed in the chamber when Fr [less than or equal to] 10, which can be seen from Figure 13 and St remains constant at 0.
When the fan was allowed to blow on the specimen directly, no oscillation was observed in the necking region because the maximum temperature was lower than the critical temperature for force oscillation.
Thus the force remains constant, and no oscillation is observed.
Between time 4 s<t<12 graph drops to almost no oscillations and has curved line.
Load Component F(x) is increasing until t = 12 s, but has smaller intensity, with no oscillations, and has small effect on Boom.
So when scientists recently announced that the most sensitive observations ever made of Procyon show no oscillations
at all, it created controversy.